Method of manufacture of line plates, scales, and the like



Se t. 5, 1961 HEDENHAIN METHOD OF MANUFACTURE 0F' LINE PLATES, SCALES AND THE LKE F1ed oct' 21, 1960 4 Sheetssheet 1 G. 2.

INVENTOR JOHANNES HEDENHAN ATTORNEY Sept' 1961 HEIDENHAIN 2,999,034

METHOD OF MANUFACTURE OF' LINE PLATES, SCALES, AND THE LKE Fed oct. 21 1960 4 Sheetssh9et 2 INVENTOR jOHANNES HEDENHAN ATTORNEY Se t. 5, 1961 J` HEIDENHAIN METHOD OF MANUFACTURE OF LINE PLATES. SCALES AND THE; LKE

4 Sheetssheat 3 Fj'1ed oct. 21' 1960 INVENTOR JOHANNES HEDENHAN p 1961 HEIDENHAIN 2,999,034

METHOD OF MANUFACTURE OF LNE PLATES SCALES AND THE; LIKE F'ed oct. 21 1960 4 SheetS-Sheet 4 |NVENTOR OHANNES HEIDENHAIN ATTORNEY.

7 transpafent inoganic layer comprises an oxide sclected from the rou consistin of Si(), Si0 Ce0 and Ti0 6' The method, as Set forth in claim l, wherein said transparent inorganic layer comprises a uo ide selected from the group consisting of MgF and I'hF 7. The method, as set forth n clain1 1 Wherein each of Said la ers com rises a lurait of interference layers 8 R0GG ces ce in the me of this patent UNITED STATES PATENTS Dimmick Iune 20 1934 0Steberg Ian. z 1945 Beeber et al. Aug. 24. 1948 Dreyfus et a1 Sept 30, 1958 

1. A METHOD OF MANUFACTURING LINE PLATES, SCALES, AND THE LIKE, BY MEANS OF LAYERS APPLIED TO A CARRIER PLATE IN FORM OF VAPORS IN A HIGH VACUUM, COMPRISING THE STEPS OF APPLYING AT LEAST TWO SUPERPOSED LAYERS ONTO SAID CARRIER PLATE CARRYING A LINE BASE OF A DESIGN COMPLEMENTARY TO THAT OF THE LINE PLATES TO BE PRODUCED, ONE OF SAID LAYERS BEING A LAYER OF TRANSPARENT INORGANIC MATERIAL APPLIED WITH A THICKNESS CORRESPONDING WITH ONEQUARTER OF THE WAVE LENGTH OF THE LIGHT AT WHICH THE FINISHED LINE PLATE IS TO BE USED, AND THE OTHER OF SAID LAYERS BEING A LAYER OF NON-TRANSPARENT METAL MATERIAL, AND TREATING SAID TWO LAYERS TO REMOVE THE PART OF SAID LINE BASE OF A DESIGN COMPLEMENTARY TO THAT OF THE LINE PLATES TO BE PRODUCED TOGETHER WITH THE PORTIONS OF SAID TWO LAYERS CARRIED BY SAID LINE BASE. 